Excerpt from my latest Sasstrology article:
"The natal Moon describes how someone was nurtured as a child, and how they respond to nurturing as an adult. When the Moon is combined with Saturn (the planet of limitations and restrictions) in a hard aspect (conjunction, square, opposition, inconjunct), a fortress is built around this most vulnerable area. Saturn can freeze emotional development, but only those who get close to the Moon/Saturn person will ever see this. In many ways the Moon/Saturn person is an iron-shelled version of the crab (symbol of the Cancer, the Moon’s sign)."